Spray head



061:. 15, 1929. G, A, MUELLER 1,731,498A

SPRAY HEAD Filed April '7, 1927 l 5a, L

fo mfi Il l A)um Patented Oct. 15, 1929 UNITED STATES PATENT OFFICE GODFREY A. UELLER, OF POINT PLACE, OHIO, ASSIGNOR TO THE DE VILBISS COM- PANY, OF TOLEDO, OHIO, A. CORPORATION OF OHIO SPRAY HEAD Application led April 7, 1927. Serial No. 181,659.

This invention relates to devices for spraying surface coating materials, and particularly to spray-heads therefor of the supplemental air discharge or fan spray type; and has 'for its object the provision of a spray-head of this character having certain novel and advantageous features of construction.

The invention is fully described in the following specification and two embodiments thereof illustrated in the accompanying drawings, in which,-

Figure 1 is a central 4longitudinal section of a spray-head embodying the invention. Fig. 2 is a cross-section thereof on the line 2--2 in Fig. 1 with a part broken away. Fig. 3 is a view similar to Fig. 1 of 'a slightly modified form of the invention, and Fig. 4 is a cross-section on the line 4-4 in Fig. 3 with a part broken away.

Referring to the drawings, l1 designates the inner or material discharge nozzle of the spray-head, which nozzle, in the present instance, is integral with and projects centrally from the forward end of a body part 2 adapted to be attached to a gun or holder, not shown,

so that said body and nozzle form a 4rigid part thereof. The nozzle throat 3, which extends back through the body part 2, is intended to have communication with a source of supply of material to be sprayed. The body 2 is radially enlarged with respect to the nozzle and forms an annular forwardly yfacing' shoulder 4 around the inner end of the nozzle 1 in concentric relation thereto, and, in the present instance, undercut to form an inwardly tapering seat. An annular shoulderA 5 is provided on the body part at the rear of the shoulder 4 for receiving the thrust of the inturned flanged end of a union nut 6.

A supplemental nozzle 7 encircles the nozzle 1 and has a conical throat tapering inwardly toward its forward end and considerably. larger than the nozzle 1 to provide a s ace therebetween. The nozzle 7 terminates s Tort of the outer restricted end of the nozzle 1 and .has the forward end of its throat open and :is

two nozzles and their outer ends extending through ears 9 on the nozzle 7 and disposed to direct air streams therefrom in converging relation with the point of meeting of the streams falling in the axial line of discharge of material from the inner nozzle 1, thereby effecting a flattening of the main spraying str eam, as well understood in the art. The union nut 6 has threaded engagement with the rear end portion of the nozzle 7 to retain it in assembled relation to the body part 2.

A combination valve and main air discharge nozzle 10 has a conical outer surface fitting the conical throat portion of the supplemental nozzle 7 and adapted to have turnlng movements therein, and has its rear endextending slightly beyond the rear end of the nozzle 7 and bearing against the seat 4 of the body part 2. It is apparent that a tightening of the union nut 6 will act through the supplemental nozzle 7 to draw and retain the intermediate nozzle 10 to its seat.

The forward end of the nozzle 10 projects beyond the forward end of the nozzle 7 and carries a nut 11 provided with a spring washer member 12 for yielding thrust engagement with the forward endof the supplemental nozzle, whereby the nozzles 7 and 10 are held in yielding asembled relation upon a loosening or removal of the union nut 6. i

The nozzle 10 has its throat gradually reduced toward its forward end to receive and provide a space around the nozzle 1 and to form a restricted main air discharge orifice 13 around and in concentric relation to the reduced discharge end of the nozzle l, whereby the material stream discharging from the nozzle 1 is entirely enveloped by the air stream discharging from the nozzle 10. The space- 14 between the nozzles 1 and 10 may have communication with a source of air pressure supply through passages 15 in the body part 2.

The communication between the air supply space 14 and the supplemental discharge passages 8 is through respective slots 16 'in the gradual opening or closing of the communication between the passages 8 and supply space 14. It is thus evident that they communication between the supplemental discharge passages 8 and air supply space 14 may be entirely closed, or the extent of opening thereof, and the consequent volume and pressure of discharge of supplemental air from said passages regulated by a turning of the nozzle 10 within the nozzle 7. In order, however, to permit such relative turning, it is necessary to loosen the union nut 6, which is again tightened after the desired adjustment has been attained. The yielding-y engagement of the nozzles 7 and 10 by reason of the action of thel spring nut 11 enables the two nozzles to retain their adjustment while the nozzle. 7,

, upon a loosening of the nut 6, is being turned to the desired angle for spray flattening purposes.

The modified form of the invention shown in Figs. 3 and 4 differs from that of the form above described by having the main air nozzle 10 in direct holding connection with the union nut instead of through the supplemental nozzle. To accomplish this, the inner end of the intermediate or main air nozzle, which is designated 10n in this form is provided with a cylindrical extension 17 adapted to encircle the body part 2a and having its puter surface threaded `for engagement with the union nut 6a. The supplemental nozzle 7l is rotatably held on the external taper of the nozzle 10a by the nut 11a and its spring washer member 12a. With this construction the supplemental nozzle may be turned on the main nozzle 10a without loosening the union nut. It is necessary, however,l to loosen such nut in order to turn the main nozzle 10a so as to obtain the desired regulation of the air discharge from the supplemental nozzle to suit the adjusted position of the supplemental nozzle. This form has its advantage in one respect over the other form in that the v supplemental nozzle may be quickly turned on the intermediate nozzle to shut o the supplemental air discharge without ried thereb loosening the union nut.

It is ap arent in both forms of the invention that t e intermediate or main air nozzle has fixed seating engagement with the body part and that the supp emental nozzle is car for rotar adjustment relative thereto, an also that t e intermediate nozzle serves both as the main air discharge nozzle of the spray-head and as a valve member for shutting ofi or regulating the air discharge from the supplemental nozzle.

I wish it understood that my invention isf not limited to any specific construction, arA lrangement or form of the parts, as it is capable of numerous modifications and changes without departing from the spirit of the claims. I

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a spray-head, a body part, an inner material discharge nozzle projecting from said body part, a main air discharge nozzle seating rearwardly against said body part and forming an air supply space between it and the inner nozzle, said main nozzle being rotatable with respect to the body p art andliaving transversely elongated spirally disposed openings therethrough at opposite sides thereof, a supplemental nozzle rotatably mounted on the main nozzle and having supplemental air discharge passages adapted to have communication through the side openings of the main nozzle with the air supply space therein, the quantity of air supply to said passages being regulable by a relative turning of said supplemental and main nozzles, means retainingthe supplemental and main air nozzles assembled and permitting relative rotation there-lv of, and means serving to hold the main air nozzle to its seat.

2. In a spray-head, a body part, an inner material discharge nozzle projecting therefrom, a main air discharge nozzle encircling the inner nozzle in spaced relation thereto and cooperating therewith to form an air supply space which has communication with a source of air pressure supply, said outer nozzle having conical outer surface and having spirally disposed openings from said -outer surface and in communication at their inner sides with said air supply space, meansmeans for retaining the supplemental andmain nozzles in adjusted relation whereby they may be rotated together relative to the inner nozzle.

3. In a spray-head, an inner material discharge nozzle, a main air discharge nozzle encircling said inner nozzle, and a supplemental air discharge nozzle mounted on the main nozzle, said main and supplemental nozzles being capable of relative rotary .adjustment to entirely shut oli' or vary tlie quantity of air supply to the supplementalnozzle and being capable of rotation together relative to the inner nozzle without axial movement relative thereto to effect a liattenin of the material discharge stream in any pre etermined plane.

4. In a spray-head, a body' part, an inner material discharge nozzle projecting ,there-v from,y a main air discharge nozzle encircling the inner nozzle 1n spaced relation thereto and in rotatable seating engagement With the body part, means for maintaining the said seating engagement of the main nozzle for rotary adjust-ment relative to the inner nozzle Without axial movements relative thereto, a supplemental air discharge nozzle rotatably mounted on the main air nozzle and having its air' discharge passages in communication with the space between the inner and main nozzles laterally through the main nozzle, the quantity of air supply to said passages being regulable by a relative turning ofsaid supplemental and main nozzles.

5. A spray-head having a body part, an inner material discharge nozzle connected to the body part, an outer air discharge nozzle cooperating with the inner nozzle to form an annular air discharge orifice in surrounding concentric relation to the discharge end of the inner nozzle and also to form a space in communication With said air discharge orifice and with a source of air supply, said outer nozzle being rotatably adj stable relativeto theinner nozzleand the body part, and a supplemental air discharge nozzle surrounding said outer nozzle for rotary adjustment both therewith and relative thereto and having its air discharge passages in communication With said space laterally through said outer nzzle, said outerandsupplementalnozzlesbeingrotatably adjustable together to change the plane of dis charge of the supplemental passages and being relatively adjustable and cooperating when so adjusted to shut off or control the quantity lof air discharge from said passages without changing the plane of their disl charge.

In testimony Whereor` I have hereunto signed my name to this specification.

GODFREY A. MUELLER. 

